I have 3 cups upside down and one of them has prize inside.

You choose one of the cups and I lift one of the cups you didn't choose and reveal what is inside.

Cup was empty, now there is two cups left. What is the probability that the cup you selected is the prized cup?

Should you change your selection at this point and what is the probability if you change your selection at this point?

This was related to coronavirus testing but we can skip that part..

You choose one of the cups and I lift one of the cups you didn't choose and reveal what is inside.

Cup was empty, now there is two cups left. What is the probability that the cup you selected is the prized cup?

Should you change your selection at this point and what is the probability if you change your selection at this point?

This was related to coronavirus testing but we can skip that part..

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